Browse Library
Sign In Start Free Trial
Close icon Search icon
Account
Browse Library Advanced Search Sign In Start Free Trial

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Clojure Reactive Programming
  • Toc
  • feedback
Clojure Reactive Programming

Clojure Reactive Programming

By : Leonardo Borges
4.3 (13)
close
Clojure Reactive Programming

Clojure Reactive Programming

4.3 (13)
By: Leonardo Borges

Overview of this book

If you are a Clojure developer who is interested in using Reactive Programming to build asynchronous and concurrent applications, this book is for you. Knowledge of Clojure and Leiningen is required. Basic understanding of ClojureScript will be helpful for the web chapters, although it is not strictly necessary.
Table of Contents (13 chapters)
close
close
Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
1. What is Reactive Programming?
1. What is Reactive Programming?
A taste of Reactive Programming
A bit of history
Signals and events
Implementation challenges
Applications of FRP
Summary
2
2. A Look at Reactive Extensions
2. A Look at Reactive Extensions
The Observer pattern revisited
Creating Observables
Manipulating Observables
Flatmap and friends
Error handling
Backpressure
Summary
3
3. Asynchronous Programming and Networking
3. Asynchronous Programming and Networking
Building a stock market monitoring application
Rolling averages
Identifying problems with our current approach
Removing incidental complexity with RxClojure
Summary
4
4. Introduction to core.async
4. Introduction to core.async
Asynchronous programming and concurrency
core.async
Rewriting the stock market application with core.async
Error handling
Backpressure
Transducers
Summary
5
5. Creating Your Own CES Framework with core.async
5. Creating Your Own CES Framework with core.async
A minimal CES framework
Exercises
A respondent application
CES versus core.async
Summary
6
6. Building a Simple ClojureScript Game with Reagi
6. Building a Simple ClojureScript Game with Reagi
Setting up the project
Reagi and other CES frameworks
Summary
7
7. The UI as a Function
7. The UI as a Function
The problem with complex web UIs
Enter React.js
ClojureScript and Om
Building a simple Contacts application with Om
Intercomponent communication
Exercises
Summary
8
8. Futures
8. Futures
Clojure futures
Fetching data in parallel
Imminent – a composable futures library for Clojure
The movies example revisited
Futures and blocking IO
Summary
9
9. A Reactive API to Amazon Web Services
chevron up
9. A Reactive API to Amazon Web Services
The problem
Infrastructure automation
AWS resources dashboard
CloudFormation
EC2
RDS
Designing the solution
Exercises
Summary
10
A. The Algebra of Library Design
A. The Algebra of Library Design
The semantics of map
Finding the average of ages
Applicative Functors
Gathering stats about ages
Monads
Summary
11
B. Bibliography
B. Bibliography
12
Index
Index

EC2

The next service we will look at is specific to EC2. As we will see, the responses of the different services aren't as consistent as we would like them to be.

The describeInstances endpoint

This endpoint sounds promising. Based on the documentation, it seems we can give it a list of instance IDs and it will give us back the following response:

{"Reservations"
   [{"Instances"
     [{"InstanceId" "EC2123",
       "Tags"
       [{"Key" "StackType", "Value" "Dev"}
        {"Key" "junkTag", "Value" "should not be included"}
        {"Key" "aws:cloudformation:logical-id", "Value" "theDude"}],
       "State" {"Name" "running"}}
      {"InstanceId" "EC2456",
       "Tags"
       [{"Key" "StackType", "Value" "Dev"}
        {"Key" "junkTag", "Value" "should not be included"}
        {"Key" "aws:cloudformation:logical-id", "Value" "theDude"}],
       "State" {"Name" "running"}}
      {"InstanceId" "EC2789",
       "Tags"
       [{"Key" "StackType", "Value" "Dev"}
        {"Key" "junkTag", "Value...

Unlock full access

Continue reading for free

A Packt free trial gives you instant online access to our library of over 7000 practical eBooks and videos, constantly updated with the latest in tech
Start a 7-day FREE trial
End of Section 4
Next Section
bookmark search playlist download
font-size

Change the font size

margin-width

Change margin width

day-mode

Change background colour

Close icon Search
Country selected
Close icon Your notes and bookmarks

Delete Bookmark

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete